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Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Summary of accounts receivable    
Total receivables $ 1,330 $ 871
Premiums and other receivables    
Summary of accounts receivable    
Total receivables 855 695
Pharmacy administrative services receivables    
Summary of accounts receivable    
Total receivables 179 0
Pharmacy rebate receivables    
Summary of accounts receivable    
Total receivables 155 154
Health insurer fee reimbursement receivables    
Summary of accounts receivable    
Total receivables $ 141 $ 22